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Costco

Department Phone Number

Toll-freeCompany-published number

Membership and warehouse (US)

1-800-774-2678
United StatesMon–Fri 6am–6pm PT; Sat–Sun 8am–5pm PT
Official source Checked Sep 20, 2026

Toll-free in the listed region. Mobile airtime and international charges may apply.

Independent directory. Slow Latitudes lists contacts for Costco. Calls go directly to the number shown.

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Before getting in touch

Costco lists a telephone for Membership and warehouse (US). Check the retailer named on your receipt.

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Sources

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